Vertipedia - Monte-Copter Model 15 Tri-phibian

Developed in 1960. The fuel tank placement on the tips of the wings provide stability on water [Ref 316].

Overview

Data on design, manufacture and status

Design authority: Monte-Copter, Inc.

Primary manufacturer: Monte-Copter, Inc.

Parent type: No type defined

Aircraft status: No longer flying

Configuration

Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift devices: 1 Single main rotor

Crew required: 1 in Side-by-side arrangement

Landing gear: Wheels (non-retractable)

Key Characteristics

Data on key physical features

Aircraft Details

Data on aircraft configuration, weights, flight performance and equipment

Layout and Dimensions

Weights and Performance

Engine Details

Primary Lift Device

Overall Dimensions
Overall Height:	2.51 m	8.3 ft
Overall Length:	10.97 m	36.0 ft
Overall Width:	10.97 m	36.0 ft

Airframe Dimensions
Airframe Length:	4.65 m	15.3 ft
Airframe Width:
Airframe Height:	2.51 m	8.3 ft

Landing Gear Dimensions
Landing Gear Base:
Landing Gear Track:

Cabin Dimensions
Cabin Internal Height:
Cabin Internal Length:
Cabin Internal Width:

Cruise Speed: 75 mph (120.701 km/h)

Weights
Max Gross Weight (ground):	907 kg	2,000 lb
Max Gross Weight (airborne):
Max Take-off Weight:	907 kg	2,000 lb
Empty Weight:	559 kg	1,232 lb

Climb Performance
Max Rate of Climb:	6 m/s	1,100 fpm

Hover Performance
Hover Ceiling IGE:
Hover Ceiling OGE:

Limitations
Max Level Flight Speed:	153 km/h	83 kts
Never Exceed Speed:
Service Ceiling:	4,572 m	15,000 ft

Range and Endurance
Max Range:	161 km	87 nm
Max Endurance:

Provided powerplant data is for uninstalled, sea level, static operations.

Powerplant
Number of engines:	2
Designation:	Continental Model 141 turbine
Manufacturer:	Continental Motors

Normal Ratings
Max continuous:
Take-off / rated:	149 kW	200 hp
Intermediate:
Maximum:

OEI Ratings
OEI contingency:
OEI continuous:
OEI 30-second:
OEI intermediate:

Main Rotor Characteristics
Diameter:	10.97 m	36.00 ft
RPM:
Direction of Rotation:	Counterclockwise
Hub Type:

Main Rotor Blade Characteristics
Blade Construction:
Blade Chord:
Blade Tip Geometry:	Tip-jet
Blade Twist:
Number of Blades:	2

Main Rotor Derived Characteristics
Disc Area:	94.56 m²	1017.9 ft²
Disc Loading:	9.59 kg/m²	1.965 lb/ft²
Solidity:

Main Rotor Blade Derived Characteristics
Blade area per blade:
Tip Speed:

Tail Rotor Characteristics
Diameter:
Configuration:	Unknown
Direction of Rotation:	Unknown
RPM:

Tail Rotor Blade Characteristics
Number of Blades:
Blade Construction:	N/A
Blade Chord:
Blade Twist:

Tail Rotor Derived Characteristics
Disc Area:
Solidity:

Tail Rotor Blade Derived Characteristics
Tip Speed:
Blade Area (per blade):

References

References and sources used

Helicopters & Autogyros of the World

Paul Lambermont, Anthony Pirie
Cassell & Company Ltd., 1959 (page 341)
Book

S-47 | S-47/R-4 Helicopter

Vinny Devine
Sikorsky Archives | Product History, Sep 19, 2017 (page 9)
Website
Very thorugh description and details of the R-4 series helicopter

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Number of engines:	2 Turbines
Max Level Flight Speed:	153 km/h	83 kts
Max Range:	161 km	87 nm
Max Endurance:

Main Rotor Diameter:	10.97 m	36.00 ft
Max Gross Weight (ground):	907 kg	2,000 lb